MINNEAPOLIS -- Top pitching prospect Kohl Stewart was placed on the 7-day Minor League disabled list with right shoulder impingement on Friday, Class A Cedar Rapids announced.

Stewart, ranked as Minnesota's No. 4 prospect and baseball's No. 31 overall prospect by MLB.com, last started for Cedar Rapids on July 17. He was scheduled to start on Wednesday, but saw his start scratched because of shoulder soreness.

"He has a shoulder problem but I don't think it's a big problem," Twins general manager Terry Ryan said. "I think he'll be all right."

The right-hander tossed five scoreless innings in his last outing to improve to 3-5 with a 2.42 ERA in 17 starts this year. The 19-year-old has struck out 58 and walked 23 in 81 2/3 innings.

Stewart was originally selected by the Twins as the No. 4 overall pick in the 2013 First-Year Player Draft.